Well, I started watching Star Trek TOS so I would get more of the memes on tenforward@lemmy.world 😅.
I do like to browse by all instead of subscribed, which is a good way to discover more communities. Of course, I do have to block a lot of communities to avoid stuff I’m not interested in… which is basically just stuff in languages I don’t understand and furries (speaking of niche communities, plenty of those). But I even enjoy seeing local posts from places in another country.
If you do want to get into it, I suggest starting with Strange New Worlds and Lower Decks.